or more pieces and telescope to provide adjustable
Valve controls may be mounted on floor stands for
operating valves below a floor. They are operated
manually by turning the handwheel or by automatic
controls. Some floor stands are equipped with
indicators to show when the valves are open or closed.
Floor stands (fig. 4-14) are essentially an extension of
the valve stem.
Post indicators (fig. 4-15) provide for operating
nonrising-stem gate valves that are below the ground
or floor level. They are used principally in fire-flow
systems, and in this function must be fully approved
by the Underwriters Laboratories and the Associated
Factory Manual Fire Insurance Companies (indicated
on the post by the letters UA and FM). The indicator
post is operated by an attached vise when not in use.
The valve is opened by turning the wrench to the left,
unless otherwise indicated. The OPEN or CLOSED
position of the valve is clearly indicated by the target
places which show the words Open and Shut in glass
protected openings on both sides of the post. Most post
indicators are sealed open for safety. If the seal has
been broken, the operator should report this condition
to higher authority immediately.
Most large manually operated valves are operated
through gears as are motor-operated valves. These
gears are housed in gearboxes.
Monthly or quarterly, lubricate the gearing under
the manufacturers instructions.
Semiannually, check gear operation through a
complete cycle of opening and closing. Listen for
undue noise and observe smoothness of operation of
the valve opening, and check for lubricant leakage
from the flanges. Upon finding any evidence of
improper operation, the operator should open the
gearbox, inspect the gears, and make necessary
Annually, inspect the housing for corrosion; clean
and paint it as necessary.
Figure 4-14.Floor stand.
All buried valves must have means for the valve
key to reach the operating nut. This unit consists of a
cast-iron pipe about 6 inches in diameter with a special
yoke at the bottom to rest on the valve bonnet and a
cover at the street level (or ground level, if not in the
street). These valve boxes are adjustable in height;
some have covers with locknuts to prevent
Figure 4-15.Floor stand with post indicator.